<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<input type="text" placeholder="员工姓名" id="i1">
<input type="text" placeholder="员工工资" id="i2">
<input type="text" placeholder="员工工作" id="i3">
<input type="button" value="添加" onclick="f()">
<table border="">
  <caption>员工列表</caption>
  <tr><th>姓名</th><th>工资</th><th>工作</th></tr>
</table>
<script>
  let i1=document.querySelector("#i1");
  let i2=document.querySelector("#i2");
  let i3=document.querySelector("#i3");
  let t=document.querySelector("table");
  function f() {
    let tr=document.createElement("tr");
    let nametd=document.createElement("td");
    let salarytd=document.createElement("td");
    let jobtd=document.createElement("td");
    nametd.innerText=i1.value;
    salarytd.innerText=i2.value;
    jobtd.innerText=i3.value;
    /*把3个td装到tr里*/
    tr.append(nametd,salarytd,jobtd);
    /*把tr装到table里*/
    t.append(tr);

  }

</script>
</body>
</html>